Muffler.



UNITED STATES PATENT OFFICE.

EDWARD R. MOFFITT, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO STANDARDMACHINE WORKS, A CORPORATION OF CALIFORNIA.

MUFFLER.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application filed December 10,1902. Serial No. 134,647.

v ing is a specification.

This invention has for its object to provide a means or deviceapplicable to "engines and motors run by explosive mixtures-such as.

gas and gasolene-for destroying or suppressing the noise produced by thedischarge of she exhaust products from the engine-cylin- The inventioncomprises certain novel construction and combination of exhaust-pipe forcarrying off the exhaust products from the engine cylinder after everyexplosion and means for spraying or injecting water in streams into theexhaust-pipe.

- The invention embraces also certain novel construction and combinationof means for utilizingthe water from the water-jacket of theengine-cylinder to spray the exhaust gases andproducts in theexhaust-pipe after the water has done service as a cooling agent.

It also-includes a novel combination and arrangement of means forintroducing air into the exhaust-pipein the return stroke of theengine-piston for the purpose of preventing the water and products frombeing drawn back into the cylinder by'the, suction or'partial vacuumproduced in the pipe by the return throw of the piston after the exhaustproducts have been expelled.

The invention also includes a novel construction of exhaust apparatusadapted for a double-cylinder gas-engine for boats and vessels in whichthe end of the discharge-pipe is submerged to close the same to theatmosphere.

The following description explains at length the nature of theseimprovements and the manner in which I proceed to construct, apply, andcarry out the same, reference being had to the accompanying drawings,forming part of this specification.

Figure 1 represents in" elevation a'noisew suppressing device orapparatus embodying my invention for a two-cylinder upright engine,showing the principal member or section of the "exhaust-pipe in sectionand a portion of the nozzle-carrying section below it broken awaytocontract the figure. This view is a vertical section taken through theline a as,

Fig. 2. Fig. 2 is a horizontal section taken through the line 2 c,Fig. 1. Fig. 3 is a vertical cross-section. Fig. 4 is an elevation,partly in section, of the principal upright member or section of theexhaust-pipe, the same being a view taken from the right side of theupright member seen in Fig. I removed from the horizontal section of thepipe that connects'it with the exhaust-ports of the two cylinders.

The position of the engine-cylinder is indicated in Fig. 2, whereportions of the two cylinders and their exhaust-ports are shown insection.

The principal parts composing the exhaust apparatus herein illustratedare designated in the following description as the horizontal section.a, the upright section b, the spraying-chamber c, and the nozzle 61. Itshould be understood, however, that these terms are employed merely toidentify and distinguish more readily the different parts or elements ofthe structure so far as their functions and operations are concerned,and I do not intend by employing these terms to limit or restrict myinvention to the particular position of the parts any more than I do totheir shape, form, and dimensions, as shown in the drawings. In thepresent arrangement, for example, the section a is provided withseparate coupling-flanges and exhaust-apertures set in horizontalposition for conveniently connecting them with the exhaustports of twocylinders of an upright engine, and this coupling-section is thereforeset horizontally. Also the section b in this instance is the moreconveniently connected to one end of the section a, and being set inupright position it necessarily is connected with the horizontal sectionaby a curved elbow; but asthe position or arrangement of theengine-cylinder, whether upright or horizontal, will obviously controlor determine the position of the members above mentioned the termsupright and horizontal, as applied herein to those sections, are usedrelatively and struction or position of such parts.

For a two-cylinder upright engine having the exhaust-ports 2 3 of thecylinders A B.

are not intended to limit or restrict the conloo for each cylinder.hothspringinz from a-oentral way or passage 4, which opens through theend of the section (a in an aperture 5 of the full diameter of thepassage. The apertures 6 7 in the end of these branches 8 9 are settoaline with the exhaust-ports 2 3 of the cylinders, and the passage 4:isconsequently common to the exhaust-ports. on the branches 8 9 arefaced to make a tight joint with flat faces 13 14 on the cylinders, towhich they are fixed by tap bolts taking through holes 15 in theflanges, and a flange 16 around the central opening at the end of thecoupling takes the curved end of the upright section 6. An annular space17 17 in the upright and horizontal sections extending from end to endfor the entire length of the .eentral exhaust-passage 4: 4", butseparated from it by an inner cylindrical wall 18 18*,

communicates with the water-space of the cylinder-jacket through ports19 19 in the branches, and each of these ports, being set in line with apassage 20, opening through the outer wall of the water-jacket, connectsthe annular space 17 17 in the exhaust-pipe directly with the spacethrough which circulation of water is maintained to cool the cylinders.The exhaust-pipe as thus constructed will be seen to contain both aconducting-passage for the exhaust products and a channel or passagewhich is an extension of the Waterjacket of the cylinder around theexhaustpipe.

In the construction which I prefer to use both sections of theexhaust-pipe are formed of concentric shells generally of a cylindricalshape and concentrically set for the greater distance in the uprightsection, but somewhat eccentrically in the horizontal section a, wheregreater width of space in the outer water-passage on one side of thecenter than on the other is provided for the purpose of giving a widerport or opening to register with the outlet-passage leading from thewater-space of the cylinder.

In both sections the inner and outer walls are united for strength bywebs or solid heads in the annular space between the two walls at theends of the sections, and through these solid portions the openingsbefore mentioned communicate and provide a continuous channel or passagefor the water; but at the lower end of the upright section, where thepassage terminates, the web 21 is perforated with a number of apertures22 at short intervals apart around the circle. Through these outlets thewater is discharged in a number of streams or jets encircling the outletend of the central exhaust-passage and in the general direction of theescaping products from the end of the passage. At this end of theexhaust-conducting passage the water and the exhaust products arebrought togr.-ther in the section 0, the internal diameter of whichbeing greater than Flanges 10 12.

pressure.

of the water and exhaust passages. In the present construction thissection a is formed of a curved elbow having a flange 23 on one end tojoin the discharge end of the upright section 7) and a screw-threadedsocket 2a in the opposite end for coupling to it the nozzle (Z. Thislast-named part is of proper length to extend from the section c throughthe hull of the boat and terminate below the water-line. Both the degreeof curvature of the elbow and the length of the nozzle are governed .bythe conditions under which the engine is required to work, its positionin the boat, the location of the exhaust-ports, their height above thewater-line, and their distance from the stern of the boat, where theexhaust is generally discharged, to the outside through the hull. Thenozzle is bent downwardly at the outer end to bring the mouth 25 inhorizontal position below the water-line, and the pipe (Z is carriedfrom the elbow cat a proper angle to keep the outer end alwayssubmerged.

The parts 0 and 1/ therefore may vary in form and in length from theconstruction shown in the drawings, in which I have embodied theinvention in an apparatus or device for a special style of uprightengine, without changing or affecting the functions of these parts ortheir relations to the-other parts of the complete device.

In the application of the improvements to a stationary engine the end ofthe dischargepipe is usually submergedin a well or cistern to dischargebelow the surface of the water. To prevent the water and exhaustproductsfrom being drawn back into the cylinderspace during the return throw ofthe pison. provision is made for destroying the partial vacuum in theexhaust-pipe by admitting air from the outside to the central passage 4through an inlet-aperture controlled by a valve. This inlet 26 isarranged between the chamber C and the exhaust-port of theenginecylinder and is usually carried from the outside through the webor solid metal at the end of the upright section of the exhaustpipe, andthe valve 27 is arranged to open inwardly and uncover the aperture byatmospheric Provision is made also for regulating the flow of the waterfrom the waterjacket into the passage surrouinling the exhaust-passageby a swinging valve or gate 25 in the passage adjacent to theoutlet-aperture in the shell or body of the water-jaurket. This positionof the gate is shown in Fig. 1 and is also indicated by dotted lines inFig. 2. The gate is turned axially by a stem 28, extending through thetop of the pipe and having a square head to take a wrench.

From the above description it will be seen that the essential featuresof my invention consist in discharging the exhaust products from theengine-cylinder into a chamber or the central passage 4 4 gives anenlarged space confined space of larger area than the disorchamberimmediately under tlieoutlet ends i charge-pipe; also, in closingthis chamber or 3 space to the atmosphere by submerging an outlet-pipeleading therefrom in a body of water; also, in utilizing the Water fromthe water-jacket of the engine-cylinder for spraying the exhaustproducts; also, in admitting atmospheric air into the exhaust-passageleading from the engine-cylinder to the spraying-chamber during thereturn throw of the engine-piston. v

Having thus fully described my invention, what I claim as new therein,and desire to secure by Letters Patent, is i 1. The combination with anexplosive-engine, of an exhaust-conduit connected with the exhaust-portthereof, the conduit having its end submergedbeneath a body of water,and an air-valve in the exhaust-pipe operated upon the return stroke ofthe engine, substantially as set forth.

2. The combination with an explosive-engine, of an exhaust-conduitconnected with the exhaust-port thereof, a channel or passage connectedwith the water-circulating space of the engine-cylinder, a chamber intowhich the gases of combustion and water are discharged, a pipe leadingfrom the said chamber having its ends submerged beneath a body of water,and an air-valve in the exhaust-pipe operated by the engine to admit airtherein and to prevent the backflow of water into the exhaust-chamberot' the engine, substantially as set forth.

3. The combination with an explosive-engine, of an exhaust-pipeconnecting with the exhaust-port of the engine-cylinder, and having apassage for the exhaust products from the cylinder and a separatepassage connecting with the water-circulating space of the cylinderWater-jacket, a chamber at the end of said exhaust-pipe common to bothof said 40 passages, the outlet end of the exhaust-passage opening intosaid chamber and the waterpassage terminating in jet-apertures adaptedto deliver the water in streams around the outlet end of theexhaust-passage, means for regulating the flow of the Water through thewater-passage, and an outlet-pipe from said chamber. 1 j

4. The combination of an exhaust-pipe having a centralexhausl'l-conducting passage and 5 a water-conducting passage separatedfrom each other, said passages being adapted for connection respectivelywith the exhaustport and with the water-jacket of the enginecylinder, achamber at the end of the exhaust- EDWARD R. MOFFITT.

'Witn esses:

A. K. DAGGETT,

EDWARD E. OSBORN.

